Experimental Study on Mechanical, Brittleness, and Fracture Behavior of Deep Shales Subjected to Fracturing Fluid-Shale Interactions at Reservoir Temperature and In-Situ Stress Conditions
文献类型：期刊论文
| 作者 | Zhao, Guokai1; Guo, Yintong2; Wang, Lei2; Chang, Xin2; Yang, Hanzhi1; Guo, Wuhao2; Wu, Xiaolong1; Yang, Chunhe1,2 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2023-09-25 |
| 页码 | 18 |
| 关键词 | Deep formation shale Fracturing fluid Mechanical behavior Brittleness X-ray micro-CT |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-023-03555-1 |
| 英文摘要 | The time-dependent characteristics of reservoir performance, where deep shale (vertical depth > 3500 m) interacts with fracturing fluid at high temperature and pressure (HTHP) during or after hydraulic fracturing, are closely related to the optimal design of fracturing in adjacent sections. However, the available information on the effect of hydration under HTHP on shale properties is insufficient, especially since the interaction between fracturing fluid and shales with different mineral compositions has rarely been considered comprehensively. In this study, fluid-shale interactions under HTHP were investigated for typical marine shales with different mineral contents (clay-rich, quartz-rich, and carbonate-rich) collected from the Wufeng-Longmaxi Formation in the southern Sichuan Basin, China. The time-dependent characteristics of the mechanical, brittleness, and fracture behaviors of immersion-treated samples at different soaking times were characterized by triaxial compression tests, and X-ray microcomputed tomography (CT) scans of post-test samples. The results show that the evolution of the mechanical parameters with soaking time is different for the three types of shales. The effect of hydration under HTHP on the strength of clay-rich shale and carbonate-rich shale except for the 15-day soaking case ranges from 39.24% to 54.88% and 24.05% to 33.99%, respectively, while the effect on quartz-rich shale is relatively slight, within 20%. The effect of hydration on the shale brittleness was evaluated based on a three-part energy-based brittleness index, in descending order, clay-rich shale > carbonate-rich shale > quartz-rich shale. The crack initiation and propagation during the deformation and failure of the soaked sample are more likely to extend along the direction of the hydration crack. For cases exhibiting quasi-ductile characteristics, hydration-induced microcracks may extend over almost the entire sample, allowing locally concentrated stresses in the immersed sample to be dispersed into each crack during deformation. The experimental results can provide data support and theoretical guidance for fracturing design in deep shale gas exploration in southern Sichuan. |
| 资助项目 | This work was supported by National Natural Science Foundation of China (No. 52104010, 52104046).[52104010] ; This work was supported by National Natural Science Foundation of China (No. 52104010, 52104046).[52104046] ; National Natural Science Foundation of China |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001071585400002 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39517]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Chang, Xin |
| 作者单位 | 1.Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Guokai,Guo, Yintong,Wang, Lei,et al. Experimental Study on Mechanical, Brittleness, and Fracture Behavior of Deep Shales Subjected to Fracturing Fluid-Shale Interactions at Reservoir Temperature and In-Situ Stress Conditions[J]. ROCK MECHANICS AND ROCK ENGINEERING,2023:18. |
| APA | Zhao, Guokai.,Guo, Yintong.,Wang, Lei.,Chang, Xin.,Yang, Hanzhi.,...&Yang, Chunhe.(2023).Experimental Study on Mechanical, Brittleness, and Fracture Behavior of Deep Shales Subjected to Fracturing Fluid-Shale Interactions at Reservoir Temperature and In-Situ Stress Conditions.ROCK MECHANICS AND ROCK ENGINEERING,18. |
| MLA | Zhao, Guokai,et al."Experimental Study on Mechanical, Brittleness, and Fracture Behavior of Deep Shales Subjected to Fracturing Fluid-Shale Interactions at Reservoir Temperature and In-Situ Stress Conditions".ROCK MECHANICS AND ROCK ENGINEERING (2023):18. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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